Just to add to what @thermokarst wrote: the functionality that you describe, @yanxianl, is a relatively straightforward use case and can currently be performed by filtering your feature table prior to generating barplots, without waiting for those additional features.
Use feature-table filter-features to set an abundance filter, or specify certain taxa.
Use taxa filter-table to include only certain clades or use feature-table filter-features with a list of taxa you want to keep as a metadata file. Either will include/exclude explicit groups/lists of taxa/features.
I hope that helps in the short-term until we add more features to barplots!